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Employee Benefit Plans And Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2011

Employee Benefit Plans And Other Postretirement Benefits [Abstract]

Components Of Net Periodic Benefit Costs

		Pension Plans												Postretirement Plans
		2011				2010				2009				2011				2010				2009
		(In thousands)
Change in Benefit Obligation
Benefit obligation at beginning of period		$	246,985			$	203,292			$	178,455			$	23,215			$	20,080			$	17,300
Service cost			19,808				18,315				17,955				1,599				1,399				1,341
Interest cost			13,473				12,091				10,208				1,189				1,130				1,022
Plan amendments			1,827				837				7,168				—				—				—
Actuarial loss			35,399				15,153				701				755				1,931				987
Participant contributions			—				—				—				942				838				656
Benefits paid			(3,337	)			(2,703	)			(11,195	)			(1,763	)			(2,163	)			(1,226	)
Benefit obligation at plan year end		$	314,155			$	246,985			$	203,292			$	25,937			$	23,215			$	20,080
Accumulated benefit obligation portion of above		$	280,820			$	214,676			$	171,384
Change in Fair Value of Plan Assets
Plan assets at fair value at beginning of period		$	167,033			$	140,065			$	97,248			$	—			$	—			$	—
Actual return on plan assets			(732	)			14,457				18,590				—				—				—
Company contributions			22,158				15,214				35,422				821				1,325				570
Participant contributions			—				—				—				942				838				656
Benefits paid			(3,337	)			(2,703	)			(11,195	)			(1,763	)			(2,163	)			(1,226	)
Fair value of plan assets at plan year end		$	185,122			$	167,033			$	140,065			$	—			$	—			$	—

Components Of Amounts Recognized In Balance Sheet

		Pension Plans								Postretirement Plans
		December 31, 2011				December 31, 2010				December 31, 2011				December 31, 2010
		(In thousands)
Development of Net Amount Recognized
Benefit obligation in excess of plan assets at December 31		$	(129,033	)		$	(79,952	)		$	(25,937	)		$	(23,215	)
Amounts Recognized in Statement of Financial Position
Current liabilities		$	(5,232	)		$	(4,107	)		$	(1,052	)		$	(1,146	)
Noncurrent liabilities			(123,801	)			(75,845	)			(24,885	)			(22,069	)
Accrued benefit recognized at December 31		$	(129,033	)		$	(79,952	)		$	(25,937	)		$	(23,215	)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax
Prior service cost		$	23,573			$	25,957			$	(481	)		$	(734	)
Actuarial loss			45,791				15,714				5,193				5,001
Total		$	69,364			$	41,671			$	4,712			$	4,267

Components Of Net Periodic Benefit Cost

		Pension Plans												Postretirement Plans
		2011				2010				2009				2011				2010				2009
		(In thousands)
Components of Net Periodic Benefit Cost
Service cost for benefits earned during the year		$	19,808			$	18,315			$	17,955			$	1,599			$	1,399			$	1,341
Interest cost on accumulated benefit obligation			13,473				12,091				10,208				1,189				1,130				1,022
Expected return on plan assets			(13,544	)			(11,207	)			(8,573	)			—				—				—
Net amortization of unrecognized amounts
Prior service cost			5,782				5,685				4,903				(416	)			(416	)			(416	)
Actuarial loss			411				247				803				449				342				328
Other			—				—				(126	)			—				—				—
Net periodic benefit cost		$	25,930			$	25,131			$	25,170			$	2,821			$	2,455			$	2,275

Schedule Of Weighted-Average Assumptions Used To Determine Benefit And Net Periodic Benefit Cost

		Pension Plans												Postretirement Plans
		2011				2010				2009				2011				2010				2009
Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31
Discount rate			4.75	%			5.50	%			6.00	%			4.50	%			5.25	%			5.75	%
Rate of compensation increase			4.00	%			4.00	%			4.00	%			N/A				N/A				N/A
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for the Years Ended December 31
Discount rate			5.50	%			6.00	%			6.00	%			5.25	%			5.75	%			6.00	%
Expected return on plan assets			7.75	%			7.75	%			8.25	%			N/A				N/A				N/A
Rate of compensation increase			4.00	%			4.00	%			4.00	%			N/A				N/A				N/A

Schedule Of Assumed Health Care Cost Trend Rates For Its Postretirement Benefits

		2011				2010				2009
Health care cost trend rate assumed for next year			8.00	%			7.50	%			7.50	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)			5.50	%			5.00	%			5.00	%
Year that the rate reaches the ultimate trend rate			2016				2016				2015

Schedule Of Effects Of One-Percentage Point Change In Assumed Health Care Cost Trend Rates On Its Postretirement Benefits

		1-Percentage Point  Increase				1-Percentage Point  Decrease
		(In thousands)
Effect on postretirement benefit obligation		$	662			$	(587	)
Effect on net postretirement benefit cost			65				(56	)

Schedule Of Pension Plans' Assets Investments

		Percentage of Fair  Value
		2011				2010
Equity securities			36	%			39	%
Debt securities			63	%			60	%
Other			1	%			1	%

Schedule Of Pension Plans' Assets Fair Value Measured On A Recurring Basis

		Fair Value Measurements at December 31, 2011
Asset Category		Total				Quoted Prices in  Active Markets for identical Assets (Level 1)				Significant  Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
		(In thousands)
Short-term investments		$	1,257			$	—			$	1,257			$	—
Equity securities:
U.S. large value			11,272				11,272
U.S. large growth			9,172				9,172
U.S. mid-cap value			1,914				1,914
U.S. mid-cap growth			3,684				3,684
U.S. small blend			3,784								3,784
Foreign large blend			27,164				27,164
Diversified emerging markets			5,306				5,306
Real estate			5,405				5,405
Debt securities:
Government bonds			24,372								24,372
Corporate bonds			91,792				36,929				54,863
Total		$	185,122			$	100,846			$	84,276			$	—

		Fair Value Measurements at December 31, 2010
Asset Category		Total				Quoted Prices in  Active Markets for identical Assets (Level 1)				Significant  Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
		(In thousands)
Short-term investments		$	1,320			$	—			$	1,320			$	—
Equity securities:
U.S. large value			10,594				10,594
U.S. large growth			8,519				8,519
U.S. mid-cap value			1,871				1,871
U.S. mid-cap growth			3,486				3,486
U.S. small blend			3,394								3,394
Foreign large blend			26,616				26,616
Diversified emerging markets			5,219				5,219
Real estate			5,095				5,095
Debt securities:
Government bonds			21,088								21,088
Corporate bonds			79,831				33,240				46,591
Total		$	167,033			$	94,640			$	72,393			$	—

Schedule Of Estimated Benefit Payments

		Pension Plans				Postretirement Plans
		(In thousands)
2012		$	5,232			$	1,052
2013			6,655				1,139
2014			8,157				1,226
2015			9,813				1,380
2016			11,457				1,481
2017 — 2021			85,357				10,258

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